The possible causes are: l The AC is not configured with an AC ID or carrier ID. In versions earlier than V200R006, configure an AC ID and carrier ID for the AC and commit the configuration. In V200R006 and later versions, the configuration model is optimized and does not include any AC ID and carrier ID. l The AC does not send neighbor detection messages to APs, APs do not report detected neighbor information to the AC, or errors occur when the AC is saving received neighbor information.
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